E355 Hot-dip Galvanized Steel Pipe

E355 is a non-alloy structural steel grade defined by European standards EN 10297-1 and EN 10305-1, renowned for its balanced mechanical strength, ductility and machinability. Unlike ordinary carbon steel grades, E355 steel is engineered to withstand moderate to high pressure, bending and impact loads, making it the ideal base material for hot-dip galvanized steel pipes that require both structural rigidity and corrosion protection. The chemical composition of E355 steel is strictly controlled to ensure consistent performance, with minimal impurities that enhance weldability and coating adhesion during the hot-dip galvanizing process.

 

E355+N Tube
Outside Diameter	6-273mm
Wall Thickness	0.5-60mm
Length	Up to 12m
Standard	EN10305-1
Grade	E355
Delivery Condition	+N
Technique	Seamless
Application	Hydraulic, mechanical and automotive.
Marking	LOGO, Standard, Grade, Size, Heat Number.
Package	Woven bag, wooden case, or as per customer's requirement.
Quality Requirement	Mill Test Certificate (EN 10204/3.1); Third Part Inspection is acceptable.

 

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The mechanical properties of E355 steel are tailored to meet industrial application demands, with yield strength and tensile strength varying slightly by wall thickness to maintain structural stability. This grade offers exceptional elongation, allowing the pipe to deform under stress without cracking, which is critical for construction projects involving pipe bending, installation and dynamic load bearing. When paired with hot-dip galvanizing, the E355 base steel retains its mechanical integrity while gaining a protective zinc layer that blocks moisture, oxidation and chemical corrosion.

 

• Chemical Composition

 

Chemical Composition of E355 Steel (Max %)	Content Standard	Impact on Pipe Performance
Carbon (C)	0.22%	Ensures balanced strength and weldability, avoids brittleness in galvanizing
Manganese (Mn)	1.60%	Enhances tensile strength and ductility, improves load-bearing capacity
Silicon (Si)	0.55%	Optimizes steel microstructure, boosts zinc coating adhesion
Phosphorus (P)	0.025%	Reduces brittleness, prevents cracking in low-temperature environments
Sulfur (S)	0.025%	Improves machinability, minimizes coating defects during galvanizing

 

• Mechanical Properties

 

Mechanical Properties of E355 Steel	Wall Thickness ≤ 65mm	Wall Thickness 65-100mm	Testing Standard
Yield Strength (Min)	355 MPa	295 MPa	EN 10297-1
Tensile Strength (Min)	490 MPa	470 MPa	EN 10297-1
Elongation (Min, A5)	22%	18%	EN 10305-1
Impact Resistance	Excellent	Good	Charpy V-Notch Test

 

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Hot-dip galvanizing is the gold standard for corrosion protection of steel pipes, and the process for E355 Hot-dip Galvanized Steel Pipe follows a rigorous, standardized workflow to ensure uniform coating thickness, strong adhesion and long service life. Unlike electro-galvanizing, hot-dip galvanizing creates a metallurgical bond between the zinc layer and the E355 steel substrate, forming a multi-layer protective structure that resists chipping, scratching and peeling during transportation, installation and daily use.

 

The galvanizing process for E355 pipes includes four key stages: surface pretreatment, flux coating, hot-dip immersion and cooling finishing. Each stage is closely monitored to eliminate rust, oil and impurities, ensuring the zinc coating adheres perfectly to the steel surface. The high-temperature immersion (450-460°C) allows molten zinc to penetrate the steel's microstructure, creating a durable barrier that blocks corrosive elements such as moisture, salt, acids and industrial pollutants. This process not only extends the pipe's service life but also reduces maintenance costs for long-term projects.

 

One of the standout advantages of E355 Hot-dip Galvanized Steel Pipe is its consistent coating quality. The zinc layer thickness meets international standards, with uniform coverage across the pipe's inner and outer surfaces, including threaded ends and welded joints. This uniform protection eliminates weak spots that are prone to corrosion, making the pipe suitable for outdoor, underground and marine environments where ordinary steel pipes would deteriorate rapidly.

 

E355 Hot-dip Galvanized Steel Pipe

 

 

To guarantee the performance and reliability of E355 Hot-dip Galvanized Steel Pipe, all products comply with strict European and international quality standards, covering dimensional tolerances, coating thickness, mechanical testing and surface quality. Reputable suppliers like GNEE STEEL implement full-process quality control, from raw material inspection to finished product testing, to ensure every pipe meets customer specifications and industry requirements.

 

Dimensional accuracy is a critical quality indicator for E355 galvanized pipes, as it directly impacts installation efficiency and structural compatibility. The outer diameter, wall thickness, length and straightness of the pipe are controlled within tight tolerances, ensuring seamless connection with fittings and compatibility with global installation standards. Additionally, all pipes undergo hydrostatic testing, ultrasonic testing and bending testing to detect defects, verify pressure resistance and confirm mechanical integrity.

 

 

Q1: What is the difference between E355 and other steel grades for galvanized pipes?

A: E355 offers higher yield strength and better ductility than lower grades like E235, making it suitable for high-load applications; it has better weldability and coating adhesion than high-carbon steel grades, ideal for hot-dip galvanizing.

 

Q2: How long is the service life of E355 Hot-dip Galvanized Steel Pipe?

A: In normal industrial and outdoor environments, the service life can reach 50+ years; in harsh marine or corrosive environments, it lasts 20-30 years with proper installation, far longer than black steel pipes or electro-galvanized pipes.

 

Q3: Can E355 galvanized pipes be customized for size and end finishing?

A: Yes, we support custom outer diameter (21.3-610mm), wall thickness (1.5-35mm), length (random or fixed), and end treatments (plain, beveled, threaded) to meet project-specific needs.

 

E355 Hot-dip Galvanized Steel Pipe is the optimal choice for projects that demand uncompromising strength, long-term corrosion resistance and cost efficiency. Whether you're sourcing for infrastructure, mechanical engineering or industrial piping, understanding its material properties and quality standards is key to securing a reliable supply chain. If you need customized specifications, detailed product certificates or competitive quotes for E355 Hot-dip Galvanized Steel Pipe, send us your inquiry now to get a tailored solution and professional support from GNEE STEEL's export team!

 

 

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